A spaceship traveling very fast relative to you fires a stream of photons at speed c away from you. You measure the photons' speed to be
A)less than c.
B)more than c.
C)equal to c.

Question

Quizplus · Accepted Answer

According to Einstein's theory of relativity, the speed of light is a constant and is the same for all observers, regardless of their relative motion. Therefore, regardless of the spaceship's speed relative to you, you will measure the speed of the photons to be c, the speed of light.

A Spaceship Traveling Very Fast Relative to You Fires a Stream